From The Collaborative International Dictionary of English v.0.48 [gcide]:
dehydrate \de*hy"drate\, v. t.
To deprive of water; to render free from water; as, to
dehydrate alcohol; to dehydrate food for preservation.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
dehydrate \de*hy"drate\, v. i.
1. to lose water or moisture.
[PJC]
2. to lose sufficent water to cause physiological distress;
-- of living organisms; as, victims trapped in the
earthquake rubble may dehydrate if not found quickly.
[PJC]
From WordNet (r) 3.0 (2006) [wn]:
dehydrate
v 1: preserve by removing all water and liquids from; "carry
dehydrated food on your camping trip" [syn: dehydrate,
desiccate]
2: remove water from; "All this exercise and sweating has
dehydrated me" [syn: dehydrate, desiccate]
3: lose water or moisture; "In the desert, you get dehydrated
very quickly" [syn: exsiccate, dehydrate, dry up,
desiccate] [ant: hydrate]